Hmm. I've caught myself overusing a word, and I'm not sure how to avoid it. Have a snippet from my current work in progress:

Despite wanting to be respectful, I couldn't let that comment slide. "So worried that you didn't even see that he was injured?"

"What?" gasped Jauffre. "Injured? Is he all right?"

"He lost quite a bit of blood, but he should be fine in the morning." I didn't add "No thanks to you". That would have been childish.

"I didn't even notice..." The monk was now quite concerned. Unwilling to torment an elderly man, even one who irritated me,...

Yes, I have somehow used the word "even" three times in a very short passage.

Are there any synonyms for "even" in this context? I did look in a thesaurus, but couldn't find anything... since I'm not even sure (ho ho) what part of speech "even" is in this context. Is it the adverb meaning "not merely this but also"? I think it is, but the synonyms given for that are all useless: indeed, nay, truly, verily, yea.

Any ideas? Go ahead and rip the passage to shreds, I'll try not to be upset. This is only the first draft anyway and I'm not hugely married to these words yet.

In both dialogue appearances, you could just delete it without losing meaning. In the last use, you could rephrase to something like "Unwilling to torment an elderly man, no matter how he irritated me..." I would probably leave the first instance alone, delete the one in the monk's line, and maybe rephrase the last one depending on how the rest of that sentence goes.

I think it would be fine if you just left it out in some of the cases. Yes, it does add a bit of nuance, but I think the best writing undermodifies, and too much of that sort of nuance, while fine in general conversational use, actually sounds awkward if done too much in writing.

So, in this particular passage I'd leave "even one who irritated me" but settle for a straightforward "that you didn't see that he was injured." Then instead of "I didn't even notice" maybe a completely different phrase to indicate the tone. (I agree that a declarative "I didn't notice" is a mismatch for what you seem to be trying to achieve with that line.)